Rainbow-electronics LM85 Manual de usuario

LM85Hardware Monitor with Integrated Fan ControlGeneral DescriptionThe LM85, hardware monitor, has a two wire digital interfacecompatible with SMBus 2

Functional Description (Continued)RegisterAddressRead/WriteRegisterNameBit 7(MSB)Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0(LSB)DefaultValueLock?6Fh R/

Functional Description (Continued)TABLE 1. Temperature vs Register Reading (Continued)Temperature Reading (Dec) Reading (Hex)(SENSOR ERROR) 80h4.3 Reg

Functional Description (Continued)Current Duty Value (Decimal) Value (Hex)...50.196% 128 80h...100% 255 FFh4.5 Register 3Eh: Company IDReg

Functional Description (Continued)Bit Name R/W Default Description1 LOCK R/W 0 Setting this bit to 1 locks specified limit and parameter registers. On

Functional Description (Continued)Bit Name R/W Default Description6 Zone 3 LimitExceededR 0 The LM85 automatically sets this bit to 1 when the tempera

Functional Description (Continued)4.11 Registers 44-4Dh: Voltage Limit RegistersRegisterAddressRead/WriteRegisterNameBit 7(MSB)Bit 6 Bit 5 Bit 4 Bit 3

Functional Description (Continued)TABLE 3. Temperature Limits vs Register SettingsTemperature Reading (Decimal) Reading (Hex)−127˚C −127 81h...−

Functional Description (Continued)This register becomes Read Only when the Ready/Lock/Start/Override register Lock bit is set. Any further attempts to

Functional Description (Continued)In Auto Fan Mode, when the temperature for a zone is above the Temperature Limit (Registers 67-69h) and below its Ab

Functional Description (Continued)RAN [3:0] Range (˚C)0011 40100 50101 6.670110 80111 101000 13.331001 161010 201011 26.671100 321101 401110 53.331111

Connection Diagram24 Pin QSOP20035302NS Package MQA24Top ViewLM85BIMQ or LM85CIMQ (55 units per rail), orLM85BIMQX or LM85CIMQX (2500 units per tape a

Functional Description (Continued)TABLE 7. Spike SmoothingZN-X[2:0] Spike Smoothed Over000 35 seconds001 17.6 seconds010 11.8 seconds011 7.0 seconds10

Functional Description (Continued)TABLE 9. PWM Duty vs Register SettingCurrent Duty Value (Decimal) Value (Hex)0% 0 00h0.3922% 1 01h...25.098% 6

Functional Description (Continued)4.19 Registers 6A-6Ch: Absolute Temperature LimitRegisterAddressRead/WriteRegisterNameBit 7(MSB)Bit 6 Bit 5 Bit 4 Bi

Functional Description (Continued)TABLE 12. Hysteresis Settings (Continued)Setting HYSTERESIS...5h 5˚C...Fh 15˚C4.21 Register 6Fh: Test Register

Functional Description (Continued)23.14 1944 42030.04 2523 42038.16 3205 42047.06 3953 42061.38 5156 42094.12 7906 420This register is not effected wh

Functional Description (Continued)Item No. Description LM85CIMQ LM85BIMQ4 Overide bit (register 40h bit 3)function with disabled PWM output(Fan config

Physical Dimensions inches (millimeters)unless otherwise noted24-Lead Molded QSOP Package,Order Number LM85BIMQ, LM86BIMQX, LM85CIMQ or LM85CIMQXNS Pa

Pin Descriptions (Continued)Symbol Pin Typ Name and Function/ConnectionRemoteRemote1+ 18 Remote ThermalDiode PositiveInputPositive input (current sour

Absolute Maximum Ratings (Notes 1,2)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distri

DC Electrical Characteristics (Continued)The following specifications apply for V+ = 3.0V to 3.6V, and all analog input source impedance RS=50Ω unless

AC Electrical Characteristics (Continued)The following specifications apply for V+ = 3.0V to 3.6V unless otherwise specified in conditions. Boldface l

Note 12: TUE , total unadjusted error, includes ADC gain, offset, linearity and reference errors. TUE is defined as the "actual Vin" to achi

Functional Description (Continued)1. Set limits and parameters (not necessarily in this order):– [5F-61h] Set PWM frequencies and auto fan control ran

Functional Description (Continued)RegisterAddressRead/WriteRegisterNameBit 7(MSB)Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0(LSB)DefaultValueLock?49h R/